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https://github.com/KhronosGroup/SPIRV-Tools
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d35a78db57
Fixes #4960 * Switches to using enum classes with an underlying type to avoid undefined behaviour
108 lines
4.0 KiB
C++
108 lines
4.0 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/fuzz/transformation_set_function_control.h"
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namespace spvtools {
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namespace fuzz {
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TransformationSetFunctionControl::TransformationSetFunctionControl(
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protobufs::TransformationSetFunctionControl message)
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: message_(std::move(message)) {}
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TransformationSetFunctionControl::TransformationSetFunctionControl(
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uint32_t function_id, uint32_t function_control) {
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message_.set_function_id(function_id);
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message_.set_function_control(function_control);
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}
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bool TransformationSetFunctionControl::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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opt::Instruction* function_def_instruction =
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FindFunctionDefInstruction(ir_context);
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if (!function_def_instruction) {
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// The given function id does not correspond to any function.
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return false;
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}
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uint32_t existing_function_control_mask =
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function_def_instruction->GetSingleWordInOperand(0);
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// Check (via an assertion) that function control mask doesn't have any bad
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// bits set.
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uint32_t acceptable_function_control_bits = uint32_t(
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spv::FunctionControlMask::Inline | spv::FunctionControlMask::DontInline |
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spv::FunctionControlMask::Pure | spv::FunctionControlMask::Const);
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// The following is to keep release-mode compilers happy as this variable is
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// only used in an assertion.
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(void)(acceptable_function_control_bits);
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assert(!(message_.function_control() & ~acceptable_function_control_bits) &&
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"Nonsensical loop control bits were found.");
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// Check (via an assertion) that function control mask does not have both
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// Inline and DontInline bits set.
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assert(!((message_.function_control() &
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(uint32_t)spv::FunctionControlMask::Inline) &&
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(message_.function_control() &
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(uint32_t)spv::FunctionControlMask::DontInline)) &&
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"It is not OK to set both the 'Inline' and 'DontInline' bits of a "
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"function control mask");
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// Check that Const and Pure are only present if they were present on the
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// original function
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for (auto mask_bit :
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{spv::FunctionControlMask::Pure, spv::FunctionControlMask::Const}) {
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if ((message_.function_control() & uint32_t(mask_bit)) &&
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!(existing_function_control_mask & uint32_t(mask_bit))) {
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return false;
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}
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}
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return true;
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}
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void TransformationSetFunctionControl::Apply(
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opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
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opt::Instruction* function_def_instruction =
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FindFunctionDefInstruction(ir_context);
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function_def_instruction->SetInOperand(0, {message_.function_control()});
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}
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protobufs::Transformation TransformationSetFunctionControl::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_set_function_control() = message_;
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return result;
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}
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opt::Instruction* TransformationSetFunctionControl ::FindFunctionDefInstruction(
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opt::IRContext* ir_context) const {
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// Look through all functions for a function whose defining instruction's
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// result id matches |message_.function_id|, returning the defining
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// instruction if found.
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for (auto& function : *ir_context->module()) {
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if (function.DefInst().result_id() == message_.function_id()) {
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return &function.DefInst();
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}
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}
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// A nullptr result indicates that no match was found.
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return nullptr;
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}
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std::unordered_set<uint32_t> TransformationSetFunctionControl::GetFreshIds()
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const {
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return std::unordered_set<uint32_t>();
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}
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} // namespace fuzz
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} // namespace spvtools
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